President Barack Obama gestures while speaking in the Rose Garden of the White House in Washington, Monday, Oct. 21, 2013, on the initial rollout of the health care overhaul. Obama acknowledged that the widespread problems with his health care law’s rollout are unacceptable, as the administration scrambles to fix the cascade of computer issues. (AP Photo/ Evan Vucci)

WASHINGTON (AP) — President Barack Obama on Monday offered “no excuses” — and little explanation — for the computer bugs still frustrating Americans who are trying to enroll online for insurance plans at the center of his health care law. But software developers tasked with building the site said they saw signs a year ago that the debut could fail.

One source of the troubles appears to be the testing procedures employed before the rollout three weeks ago. Several developers of the HealthCare.gov website told The Associated Press they were worried for months about the system’s readiness and whether the software meant to link key computer systems was being properly put through its paces.

In addition, congressional investigators raised concerns recently that the Centers for Medicare and Medicaid Services had taken on the job of testing the computer systems for the new markets during the final weeks before the sign-ups opened Oct. 1. That job is often handled by specialized software companies.

Obama, who emphasized the website’s simplicity in the week’s leading up to the insurance sign-ups, acknowledged there could now be “no sugarcoating” the problems even as he talked up the benefits of the law at a Rose Garden event that had the feel of a pep rally.

“The website that’s supposed to make it easy to apply for and purchase the insurance is not working the way it should for everybody,” he said.

He insisted that the problems would be fixed and all Americans seeking insurance would be able to sign up. But it was not clear how quickly that would happen. The administration is beefing up call centers and encouraging more people to enroll over the phone while the website problems persist.

The flood of computer problems since the website went online has been deeply embarrassing for the White House. The glitches have called into question whether the administration is capable of implementing the complex policy and why senior White House officials — including the president — appear to have been unaware of the scope of the problems when the health insurance markets, known as exchanges, opened.

Obama stopped short of apologizing for the failures, saying instead that “nobody is more frustrated than me.”

Even as he spoke, more problems came to light. The administration acknowledged that a planned upgrade to the website had been postponed indefinitely and that online Spanish-language signups would remain unavailable, despite a promise to Hispanic groups that the capability would start this week.

The White House says additional technology experts from both inside and outside the government are being brought in to work on the failures.

Administration officials initially blamed heavy website traffic for the frozen computer screens that many people encountered when they first logged on. Since then, they have also acknowledged shortcomings with software and some elements of the system’s design, although the administration has yet to fully detail exactly what went wrong with the online system and who was responsible for the problems.

It appears the problems were well-known to some of those designing the system. One developer said that in the weeks leading up to the Oct. 1 launch, he and his colleagues huddled in conference rooms trying to patch deficiencies in computer code.

“It was an extremely tight deadline,” said the developer, who spoke on condition of anonymity because he was told not to talk to the news media about his work.

A review of internal structural diagrams obtained by the AP also revealed the complexity of the system. Insurance applicants have a host of personal information verified, including income and immigration status. The system does that by connecting to other federal computer networks, including ones at the Social Security Administration, IRS, Veterans Administration, Office of Personnel Management and the Peace Corps.

The schematics from late 2012 show how officials preferred a “data services hub” — a traffic cop of sorts for managing information — instead of a setup that would have allowed state exchanges to connect directly to government servers when verifying an applicant’s information.

On Sunday, the Department of Health and Human Services said the data hub was working, but the initial consumer experience had not lived up to the public’s expectations. “We are committed to doing better.”

Administration officials have so far refused to say how many people have actually managed to enroll in insurance during the three weeks since the new marketplaces became available. Without enrollment numbers, it’s impossible to know whether the program is on track to reach the projections from the Congressional Budget Office, which estimated 7 million people would gain coverage during the first year the exchanges were available.

Officials have instead pointed selectively to figures putting the insurance exchanges in a positive light. They say more than 19 million people have logged on to the federal website and nearly 500,000 have filled out applications for insurance through both the federal and state-run sites. The applications must be completed before people can enroll in insurance policies.

An internal memo obtained by the AP showed that the administration had projected nearly a half million people would actually enroll for the insurance markets during the first month.

Uninsured Americans have until about mid-February to sign up for coverage if they are to meet the law’s requirement that they be insured by the end of March. If they don’t, they will face a penalty.

Officials say that at this point they are not considering extending the enrollment window beyond that time. They also say they are not considering taking the website down for an extended time to address the problems, but instead will do that maintenance during low-traffic overnight hours.

But the White House appeared to open the door to not penalizing those whose efforts to sign up were confounded by the system’s problems.

“The law is clear that if you do not have access to affordable health insurance, then you will not be asked to pay a penalty because you haven’t purchased affordable health insurance,” White House spokesman Jay Carney said.

So far, no one within the administration is known to have been fired for the problematic rollout. Some Republicans have focused their ire on Health and Human Services Secretary Kathleen Sebelius, though the White House says she continues to have the confidence of the president.

Sebelius is scheduled to testify about the botched rollout before the House Energy and Commerce Committee next week. Representatives from some of the contractors working on the websites were also scheduled to testify before the committee on Thursday.

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